So we have a new build - and currently no cabling at all has been installed. So we have no current phone line, broadband or ISP.
That's normal.
The final drop from the pole or footway box isn't made until you order a service.
I think the develop should have don’t something that was more than nothing, but they didn’t!
That's an assumption. I'm not so sure the developer did nothing.
Usually when a developer of 4 homes contacts OpenReach's new site team they get a quote on how much FTTP will cost. Alternatively they can take copper for free.
As your street has a full fibre rollout about to start things will have been a little different.
If the developer had contacted the OpenReach new site team they may well have been told there's an ongoing rollout in that street and the properties will be added to the rollout free of charge.
In an likelihood it would not have been possible for the developer to pay and have FTTP installed
before the rest of the street got FTTP (before you moved in).
The fact these new builds are showing on the OpenReach checker as being part of a full fibre build plan suggests to me the developer has indeed been in touch with OpenReach.
Without the developer contacting OpenReach the chances are the new builds wouldn't be in these plans.